Shoemaker-Levy 9彗星撞击的羽流发展
Plume Development of the Shoemaker-Levy 9 Comet Impact
摘要：
利用ZEUS-MP 2流体动力学程序研究了木星彗星撞击后羽流的形成。三维模型跟踪直径为500、750和1000米的物体。我们的模拟显示，在撞击彗星的尾流中，羽流的快速向上移动分量的发展，该羽流在1巴压力水平以下约50公里处，最大质量和能量沉积深度以上约100公里处从大部分彗星物质中“夹断”。快速移动的部分质量约为初始彗星的两倍，但几乎全部（>99.9%）由木星大气组成，而不是彗星物质。喷出物主要沿撞击轨迹上升，但由于浮力，在撞击后数秒内产生了额外的垂直速度分量，导致喷出物相对于进入轨迹不对称。在0.1 < v < 10 km/s的速度范围内，向上运动的分量的质量遵循一个速度分布M（>v），近似与v^-1.4成正比（对于750 m和500 m的情况，v^-1.6）。
英文摘要：
We have studied plume formation after a Jovian comet impact using the ZEUS-MP 2 hydrodynamics code. The three-dimensional models followed objects with 500, 750, and 1000 meter diameters. Our simulations show the development of a fast, upward-moving component of the plume in the wake of the impacting comet that "pinches off" from the bulk of the cometary material ~50 km below the 1 bar pressure level, ~100 km above the depth of greatest mass and energy deposition. The fast-moving component contains about twice the mass of the initial comet, but consists almost entirely (>99.9%) of Jovian atmosphere rather than cometary material. The ejecta rise mainly along the impact trajectory, but an additional vertical velocity component due to buoyancy establishes itself within seconds of impact, leading to an asymmetry in the ejecta with respect to the entry trajectory. The mass of the upward-moving component follows a velocity distribution M(>v) approximately proportional to v^-1.4 (v^-1.6 for the 750 m and 500 m cases) in the velocity range 0.1 < v < 10 km/s.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
